<el-scrollbar max-height="100%">
  <el-menu :default-active="currentRoute" class="el-menu-vertical-demo" @select="handleMenuSelect">
    <el-menu-item v-for="e in menuList" :key="e.route" :index="e.route">
      <iconfont :name="e.icon"></iconfont>
      <span>{{e.tittle}}</span>
    </el-menu-item>
  </el-menu>
</el-scrollbar>
